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#ifndef __PIECE_GENERATOR_H__
#define __PIECE_GENERATOR_H__

#include <fstream>

/// Abstract class which generates the next piece
class PieceGenerator
{
public:
    virtual ~PieceGenerator() = 0;

    /// Gets the next piece
    /*!
     * @param numBlocks location to store number of blocks in the next piece
     * @return pointer to array containing the piece block coordinates
     */
    virtual const int * getNextPiece(int &numBlocks) = 0;
    /// Reset the state of the PieceGenerator
    virtual void reset() = 0;
};

/// PieceGenerator which pulls pieces from given file
class FilePieceGenerator : public PieceGenerator
{
public:
    /*!
     * @param filename file to pull pieces from
     */
    FilePieceGenerator(const char *filename);
    ~FilePieceGenerator();

    virtual const int * getNextPiece(int &numBlocks);
    virtual void reset();

private:
    int pieceBuffer[14];
    std::ifstream stream;
};

/// Generates pieces randomly
class RandomPieceGenerator : public PieceGenerator
{
public:
    RandomPieceGenerator();

    virtual const int * getNextPiece(int &numBlocks);
    virtual void reset() { }

private:
    static int pieceCoords4[7][8];
    static int pieceCoords5[18][10];
    static int pieceCoords6[60][12];
    static int pieceCoords7[195][14];
};

#endif
